iPadOS 11.2.1 (build 15C153) is an official Apple over-the-air update for the iPad mini 3 (Cellular), released on 2017-12-13T18:06:32Z. The update package is 526.48 MB. This is a delta (partial) update that requires 11.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: aad19db7396ad653a530bb0c3576c4007357892b.zip.